What is Poly Ferric Sulfate CAS 35139-28-7?

Poly Ferric Sulfate, commonly called PFS or SPFS, is a pre-polymerized ferric sulfate coagulant used mainly in water and wastewater treatment. The CAS number 35139-28-7 identifies the polymerized ferric sulfate material, which is generally represented by the variable formula [Fe2(OH)n(SO4)3-n/2]m rather than one fixed molecular formula.

How does PFS differ from ordinary ferric sulfate CAS 10028-22-5?

Ordinary ferric sulfate is the simple iron(III) sulfate salt, while PFS is a pre-polymerized ferric coagulant. Because PFS already contains polymeric ferric species, it often forms larger, denser flocs, can work over a useful pH range, and may require a lower dosage than conventional ferric or aluminum coagulants.

What is Poly Ferric Sulfate used for in water treatment?

It is used as a coagulant and flocculant for drinking-water clarification, surface-water treatment, municipal sewage treatment, industrial wastewater treatment, phosphorus removal, and sludge conditioning. The product helps remove suspended solids, turbidity, color, and phosphate through charge neutralization and bridging flocculation.

What forms and typical specifications should be checked for PFS?

PFS is commonly supplied as a reddish-brown liquid or as a yellowish to brown solid powder or granular product. Commercial specifications vary, so confirm physical form, total iron content, basicity, pH, density or bulk properties, water-insoluble matter, and any application-specific limits before ordering.

How should Poly Ferric Sulfate be stored and dosed?

Store it in tightly closed, corrosion-resistant containers in a cool, dry, well-ventilated area away from direct sunlight and alkalis. Because PFS solutions are acidic, use acid-compatible dosing equipment and determine the optimum dose by jar testing; avoid mixing directly with alkaline chemicals before dilution.

Poly Ferric Sulfate CAS 35139-28-7

Poly Ferric Sulfate (PFS) is supplied as an inorganic polymer coagulant designed for use in water and wastewater treatment systems. It is commonly applied in municipal water purification, industrial effluent treatment, and sludge dewatering processes, where it functions by promoting rapid flocculation and effective removal of suspended solids and contaminants. Polyaluminum Chloride is a related aluminium-based coagulant for clarification-program selection.

From a supply perspective, PFS is typically available in aqueous solution or solid form depending on application and logistics requirements. It is provided in standard industrial packaging suitable for bulk handling, with supporting documents such as COA, TDS, and SDS available for procurement and compliance purposes.

CAS: 35139-28-7
Synonyms: Polyferric Sulfate; Polymerized Ferric Sulfate; PFS
Grade: Industrial grade (water treatment use)
Package: Available in standard export packaging; packaging format depends on supply form (liquid or solid) and order volume

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Product Description

1 Physicochemical Properties

2 Typical Applications

3 Packaging

4 Storage

Physicochemical Properties

Item	Typical Description
Appearance	Reddish-brown liquid or yellowish to brown solid (powder/granular)
Odor	Mild acidic odor
Solubility	Readily soluble in water (solid form)
pH (Aqueous Solution)	Typically acidic
Density	Higher than water (liquid form, varies with concentration)
Active Content	Supplied as polymeric ferric sulfate solution or solid; composition varies by grade
Stability	Stable under normal storage conditions; avoid dilution with alkaline materials before use

Typical Applications

Municipal drinking water treatment as a primary coagulant
Industrial wastewater treatment, including removal of suspended solids and phosphorus
Sludge conditioning and dewatering processes
Pre-treatment in surface water clarification systems

For related water-treatment coagulant pages, compare Ferric Chloride, Polyferric Sulfate, and Aluminum Chlorohydrate.

Packaging

Poly Ferric Sulfate is supplied according to its physical form. Liquid products are typically delivered in sealed drums, IBC containers, or bulk tank systems suitable for industrial dosing and handling. Solid forms are packed in moisture-resistant bags or lined containers to maintain stability during storage and transport.

All packaging is prepared for export handling, with attention to container integrity, sealing, and compatibility with acidic materials. Packaging formats can be aligned with order quantity and logistical requirements.

Storage

Store in a cool, well-ventilated area away from direct sunlight and sources of heat. Containers should remain tightly closed to prevent contamination or evaporation (for liquid forms). For solid products, protection from moisture is important to maintain product performance.

Avoid contact with alkaline substances during storage. Maintain original packaging integrity during transport and handling.

FAQ - Technical & Supply Chain

Q:
What is Poly Ferric Sulfate CAS 35139-28-7?

A: Poly Ferric Sulfate, commonly called PFS or SPFS, is a pre-polymerized ferric sulfate coagulant used mainly in water and wastewater treatment. The CAS number 35139-28-7 identifies the polymerized ferric sulfate material, which is generally represented by the variable formula [Fe2(OH)n(SO4)3-n/2]m rather than one fixed molecular formula.
Q:
How does PFS differ from ordinary ferric sulfate CAS 10028-22-5?

A: Ordinary ferric sulfate is the simple iron(III) sulfate salt, while PFS is a pre-polymerized ferric coagulant. Because PFS already contains polymeric ferric species, it often forms larger, denser flocs, can work over a useful pH range, and may require a lower dosage than conventional ferric or aluminum coagulants.
Q:
What is Poly Ferric Sulfate used for in water treatment?

A: It is used as a coagulant and flocculant for drinking-water clarification, surface-water treatment, municipal sewage treatment, industrial wastewater treatment, phosphorus removal, and sludge conditioning. The product helps remove suspended solids, turbidity, color, and phosphate through charge neutralization and bridging flocculation.
Q:
What forms and typical specifications should be checked for PFS?

A: PFS is commonly supplied as a reddish-brown liquid or as a yellowish to brown solid powder or granular product. Commercial specifications vary, so confirm physical form, total iron content, basicity, pH, density or bulk properties, water-insoluble matter, and any application-specific limits before ordering.
Q:
How should Poly Ferric Sulfate be stored and dosed?

A: Store it in tightly closed, corrosion-resistant containers in a cool, dry, well-ventilated area away from direct sunlight and alkalis. Because PFS solutions are acidic, use acid-compatible dosing equipment and determine the optimum dose by jar testing; avoid mixing directly with alkaline chemicals before dilution.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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